The year is 1942. "Major Clement Wisdom of the Secret Intelligence Bureau is in Sydney, Australia to learn Morse Code and its Japanese equivalent, Kana Morse. But when a fellow student from the college is found dead and another missing, Clement begins to suspect espionage. While assisting the local police, Clement uncovers a network of enemy spies, fuelled by long held resentments and treacherous greed. In May, three Japanese submarines entered Sydney Harbour. Their intention was to destroy the USS Chicago and as many other Allied ships in port as possible. Or was there another reason..."